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I can't comment with any authority about any of the cities and their rankings but I do think that a huge component of achieving a high "green" score is having a comprehensive public transportation system like Portland has. I have to believe that the ones scoring low don't have any way to get around except for personal vehicles. I live in Houston and that is certainly the case here. We have a lovely (though tiny) rail system but it goes nowhere near the major concentrations of commuters so except for a few Park & Ride routes that take riders into the downtown and Medical Center business areas, everybody is pretty much stuck driving their own cars to work.